1.1 本试验方法涵盖了确定样品中羊绒粗毛含量是否超过规定值的连续程序。 注1: 关于羊绒中允许的最大羊绒粗毛含量，请参阅规范 D2817 . 注2: 有关羊绒头发以及羊绒头发与其他纤维的混合物的定量分析，请参阅测试方法 D629页 . 1.2 本试验方法仅适用于粗纱、纱线或织物形式的羊绒毛，以及与其他纤维混纺的羊绒毛含量，其中预期的羊绒粗毛含量不超过5%（见 表1 ). 有关羊绒粗毛的更大预期质量百分比，请参阅测试方法 D629页 . 这些研究的数据存档于ASTM D13委员会D13.13小组委员会秘书处。 1.3 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 本试验方法可用于确定是否符合最大羊绒粗毛含量规范，并要求用于确定是否符合规范 D2817 . 5.1.1 如果因使用测试方法时报告的测试结果的差异而产生争议 D2816 对于商业装运的验收测试，买方和供应商应进行比较测试，以确定其实验室之间是否存在统计偏差。建议为调查偏差提供称职的统计协助。作为最低要求，双方应尽可能均匀地从大量相关类型的材料中选取一组试样。然后，应将试样以相同数量随机分配给每个实验室进行测试。两个实验室的平均结果应使用学生的 t -测试未配对数据和双方在测试开始前选择的可接受概率水平。 如果发现偏差，必须找到并纠正其原因，或者买方和供应商必须同意根据已知偏差解释未来的测试结果。 5.2 当被测产品的羊绒粗毛含量在任何一方面都显著偏离规定量时，本文所述的顺序测试程序将导致在所述置信水平下作出决定所需的观察次数大幅减少。另一方面，当被测产品的羊绒粗毛含量接近规定量时，顺序程序可确保进行必要的增加观察次数，以确保在规定的置信水平下做出正确决定。

1.1 This test method covers a sequential procedure for determining whether or not the cashmere coarse-hair content of a sample exceeds a specified value. Note 1: For the maximum allowable cashmere coarse-hair content in cashmere, refer to Specification D2817 . Note 2: For the quantitative analysis of cashmere hair and blends of cashmere hair and other fibers, refer to Test Methods D629 . 1.2 This test method is applicable only to cashmere hair in the form of roving, yarn, or fabric, and to the cashmere hair content of blends with other fibers, where the expected cashmere coarse-hair content is not more than five mass percent (see Footnote C of Table 1 ). For greater expected mass percentages of cashmere coarse-hair, see Test Methods D629 . The data from these studies are on file with the Secretary of Subcommittee D13.13, Committee D13 of ASTM. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 This test method may be used for determining compliance with a specification for maximum cashmere coarse-hair content and is required to be used for determining compliance with Specification D2817 . 5.1.1 In case of a dispute arising from differences in reported test results when using Test Method D2816 for acceptance testing of commercial shipments, the purchaser and the supplier should conduct comparative tests to determine if there is a statistical bias between their laboratories. Competent statistical assistance is recommended for the investigation of bias. As a minimum, the two parties should take a group of test specimens that are as homogeneous as possible and that are from a lot of material of the type in question. The test specimens should then be randomly assigned in equal numbers to each laboratory for testing. The average results from the two laboratories should be compared using Student's t -test for unpaired data and an acceptable probability level chosen by the two parties before the testing is begun. If a bias is found, either its cause must be found and corrected or the purchaser and the supplier must agree to interpret future test results in the light of the known bias. 5.2 When the product being tested has a cashmere coarse-hair content that departs significantly either way from the specified amount, the sequential test procedure described herein will result in a substantial reduction in the number of observations required for a decision at the stated level of confidence. On the other hand, when the product being tested has a cashmere coarse-hair content that approaches the specified amount, the sequential procedure ensures that the necessary increased number of observations shall be made to secure a correct decision at the stated level of confidence.